Jason rotary power telescope manual

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Number on the Telescope Eyepiece The number on the eyepiece is the focal length of the eyepiece. It is not the magnification of the eyepiece. Eyepiece Magnification The magnification of any telescope eyepiece used with your telescope will be the focal length of the telescope (consult your manual) divided by the focal length of the eyepiece. A telescope with a focal length of 1200mm will yield a magnification of 60x when you insert a 20mm eyepiece into the focuser. A telescope with a focal length of only 600 mm, however, will yield only 30x when used with the same 20mm eyepiece. Telescope Eyepieces for Beginners ALWAYS start observing with the lowest magnification eyepiece available until you become skilled in the use of your telescope. This will be the eyepiece marked with the BIG number (longer focal length not one of the smaller numbers. Again, the number you see on the eyepiece is the focal length, not the magnification. Low vs High Magnification A low magnification eyepiece has a wider field of view (the amount of sky you see when looking through the eyepiece) than a high magnification telescope eyepieces. The low-magnification eyepiece therefore makes it easier to capture an object you are trying to find in your telescope. Your lowest magnification eyepiece will also give you the sharpest image as well as the brightest image. Once you have located an object with your low magnification eyepiece, move the telescope so the object is as close to the center of the telescope field of view as possible. Replace the low magnification eyepiece with one of higher magnification. If the object is not visible after you have changed to the high magnification eyepiece, go back to the low magnification eyepiece and start again. Increasing Magnification A basic law of optics states that as magnification increases, image brightness decreases. In fact, if you increase.
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